Chapter 2 — Prepolarized Free-field
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" Microphone Type 4188
Frequency Response
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
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increases from 0dB at the reference frequency (1000Hz) to approximately 0.6dB at
1Hz.
For applications where the vent is not exposed to the sound field, take care to
ensure proper static pressure equalization to prevent static displacement of the
diaphragm.
The microphone’s low-frequency response is common for all types of sound field.
The microphone’s lower limiting frequency (–3dB) is between 1 and 5Hz with the
vent exposed to the sound field. This is measured during production to ensure that
specifications are fulfilled.
2.3.5 Free-field Response
The microphone’s free-field correction curves are shown in Fig.2.6, Fig.2.8 and
Fig.2.10. These corrections are added to the microphone’s actuator response ob-
tained using Electrostatic Actuator UA0033 in order to determine the free-field
response at any angle of incidence. The typical free-field response at 0° incidence
with and without the protection grid, and with Random Incidence Corrector
DZ9566 are shown in Fig.2.7, Fig.2.9 and Fig.2.11, respectively.
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